Well before the beginning of the Common Era, Jews with some Greek education had begun to make casual use of popular Greek philosophy in expounding their revealed religion: there are traces of this in the wisdom literature of the Hebrew Bible. In the New Testament, Paul the Apostle’s speech to the Areopagus (Acts 17) uses commonplaces of Stoic philosophy for apologetic purposes. But, as far as is known, the first Jew who was really well-read in Greek philosophy and used it extensively in the exposition and defense of his traditional religion was Philo Judaeus (Philo of Alexandria [c. 15 bce–after 45 ce]), an older contemporary of Paul. Philo expressed his philosophical religion in the form of lengthy allegorical commentaries on the Jewish Scriptures, especially on Genesis. In these he showed to his own satisfaction that the ancient revelation given to Moses accorded with the teaching of the best Greek philosophers, which, in his view, was later and derivative. The Greek philosophy that he preferred and found to be most in accordance with revelation was an early form of Middle Platonism. Philo was neither approved of nor read by later orthodox Jews, but his influence on Greek-speaking and Greek-educated Christians from the 2nd century ce was great; and in important ways he determined the tone of their religious speculation.

Like Philo, the Christian Platonists gave primacy to revelation and regarded Platonic philosophy as the best available instrument for understanding and defending the teachings of Scripture and church tradition. But, also like Philo, they did not believe that truth could conflict with truth and were confident that all that was rationally certain in Platonic speculation would prove to be in perfect accordance with the Christian revelation. Their unhistorical approach and unscholarly methods of exegesis of texts, both pagan and Christian, facilitated this confidence. The general attitude of Christian Platonists was one of relatively moderate and humane otherworldliness (the cruder sorts of Christian otherworldliness and hatred of the body seem to derive from non-Platonic and non-Greek sources). They stressed the transcendence of God, though, by insisting that it is a transcendence that is also the deepest immanence, they acknowledged his intimate presence within the world as well. They took a dualistic view of soul and body (though accepting bodily resurrection) and emphasized the primacy of the spiritual, while insisting on the goodness of God’s material creation.

From the middle of the 2nd century ce Christians who had some training in Greek philosophy began to feel the need to express their faith in its terms, both for their own intellectual satisfaction and in order to convert educated pagans. The philosophy that suited them best was Platonism. Though Stoicism had exerted a considerable influence on Christian ethical thinking (which has persisted to modern times), Stoic corporealism—the belief that God and the soul are bodies of a subtle and peculiar kind—repelled most Christians, and Stoic pantheism was incompatible with Christianity. The Platonism that the first Christian thinkers knew was of course Middle Platonism, not yet Neoplatonism. Its relatively straightforward theism and high moral tone suited their purposes excellently; and the influence of this older form of Platonism persisted through the 4th century and beyond, even after the works of Plotinus and Porphyry began to be read by Christians.

The first Christian to use Greek philosophy in the service of the Christian faith was Justin Martyr (martyred c. 165), whose passionate rejection of Greek polytheism, combined with an open and positive acceptance of the essentials of Platonic religious philosophy and an unshakable confidence in its harmony with Christian teaching, was to remain characteristic of the Christian Platonist tradition. This was carried on in the Greek-speaking world by Clement of Alexandria (c. 150–c. 215), a persuasive Christian humanist, and by the greatest of the Alexandrian Christian teachers, Origen (c. 185–254). Although Origen was consciously more hostile to and critical of Platonic philosophy than either Justin or Clement, he was, nonetheless, more deeply affected by it. He produced a synthesis of Christianity and late Middle Platonism of remarkable originality and power, which is the first great Christian philosophical theology. In spite of subsequent condemnations of some of his alleged views, his influence on Christian thought was strong and lasting. The Greek philosophical theology that developed during the Trinitarian controversies over the relationships among the persons of the Godhead, which were settled at the ecumenical councils of Nicaea (325) and Constantinople (381), owed a great deal to Origen on both sides, orthodox and heretical. Its most important representatives on the orthodox side were the three Christian Platonist theologians of Cappadocia, Basil of Caesarea (c. 329–379), Gregory of Nazianzus (c. 330–c. 389), and Basil’s brother Gregory of Nyssa (c. 335–c. 394). Of these three, Gregory of Nyssa was the most powerful and original thinker (as well as the closest to Origen). He was the first great theologian of mystical experience, at once Platonic and profoundly Christian, and he exerted a strong influence on later Greek Christian thought.

St. Gregory of Nyssa, detail of a mosaic in the Palatine Chapel, Palermo, Italy; 12th centuryAlinari/Art Resource, New York

At some time between the period of the Cappadocian Fathers and the early years of the 6th century, a new turn was given to Christian Platonism by the remarkable writer who chose to publish his works under the name of St. Paul’s convert at Athens, Dionysius the Areopagite. The kind of Platonism that the Pseudo-Dionysius employed for his theological purposes was the 5th-century Neoplatonism that is best represented by Proclus (see aboveThe later Neoplatonists). Almost everything about this mysterious author is vigorously disputed by scholars, but there can be no doubt about the influence that his system of the hierarchic universe exerted upon later Christian thought. His vision of human ascent through it—carried up by divine love, to pass beyond all hierarchy and all knowledge into the darkness of the mystical union with God—had its impact both in the East, where one of the greatest of Greek Christian Platonist thinkers, Maximus the Confessor (c. 580–662), was deeply influenced by the Dionysian writings and commented extensively upon them, and in the West, where they became known and were translated into Latin in the 9th century. In the Latin West there was more than one kind of Christian Platonism. An impressive and extremely difficult philosophical theology, employing ideas approximating Porphyry’s version of Neoplatonism to explain and defend the orthodox doctrine of the Trinity, was produced in the second half of the 4th century by the rhetorician and grammarian Marius Victorinus. A strong and simple Platonic theism and morality, which had a great influence in the Middle Ages, was nobly expressed in the final work of the last great philosopher-statesman of the ancient world, Boethius (c. 470–524). This was the De consolatione philosophiae (Consolation of Philosophy), written in prison while its author was under sentence of death. Boethius was also influential in the medieval West through his translations of Aristotle’s logical works, especially the Categories together with Porphyry’s Isagoge (“Introduction”), on which he in turn produced two commentaries. But the Christian Platonism that had the widest, deepest, and most lasting influence in the West was that of Augustine of Hippo (354–430).

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